Can't send command to SMTP host

Hi,
I am using Jdev11.1.1.2.0 and web logic servere10.3.I am using mail scheduling in weblogic.Actually in window server 2003 I am getting exception is
get message method--->Can't send command to SMTP host
javax.mail.MessagingException: Can't send command to SMTP host;
nested exception is:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
But same application windows7 Its working.
So can u give me the idea ? or any configuration webloigc in windows server 2003 ?
Plz help me.
Thanks
Anup

I put environment variable (path) weblogic.jar but still same issue
get message method--->Can't send command to SMTP host
javax.mail.MessagingException: Can't send command to SMTP host;
nested exception is:
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at com.sun.mail.smtp.SMTPTransport.sendCommand(SMTPTransport.java:1564)
Plz give me the solution..
Thanks
Anup

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